Toshiba GR200 Series - 2.19 Broken conductor protection (BCD)

6F2S1914 (0.49)
GRL200 (Soft 033 & 037)
- 285 -
Broken conductor protection (BCD)
A series fault or an open circuit fault can be caused by circuit breaker contact failure, the
operation of fuses, and false operation of single-phase switchgear. IEC60050 defines a series
fault as having impedances in each of three-phases that are not equal; hence, the series fault
is typified by the interruption of one or two phases, as a rule. The function of broken conductor
protection (BCD) is to detect series faults and signal a trip signal to the trip circuit.
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Note: Several IED models do not have broken conductor protection feature. To determine
whether the features are implemented in the IED or not, locate the IED ordering number; and
check the order number at “G&T position” referring to the comparison table below. For more
information, see Appendix: Ordering .
Table 2.19-1 Comparative table in respective ordering numbers
feature
Ordering No. at “G&T”
33
37
BCD
Broken conductor protection
✓
✓
✓: Applicable NA: Not applicable